Submission #768246

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
768246	2023-06-27 19:35:34	rainboy	Hard route (IZhO17_road)	C11	100 / 100	372 ms	54356 KiB

road

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 500000
int *ej[N], eo[N], eo_[N];
void append(int i, int j) {
  int o = eo[i]++;
  if (o >= 2 && (o & o - 1) == 0)
    ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]);
  ej[i][o] = j;
}
long long x_, y_;
int dd[N], kk[N];
void dfs(int p, int i, int r) {
  int o;
  dd[i] = 0, kk[i] = 1;
  for (o = eo[i]; o--; ) {
    int j = ej[i][o];
    if (j != p) {
      int d, k;
      long long x, y;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

road.c: In function 'append':
road.c:12:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   12 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
road.c: In function 'main':
road.c:54:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
road.c:58:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 19 / 19
• Subtask 2: 33 / 33
• Subtask 3: 48 / 48